China is, not surprisingly, considered a major market for Internet companies, although some tech giants, such as Google Inc. and Yahoo Inc., have had to struggle with censorship and other restrictions in the Asian nation.

In fact, in rolling out its China site, LinkedIn Chief Executive Jeff Weiner said the move “presents a challenge that our company must address directly, clearly and in a manner consistent with our core values.”

Mobile is another challenge for LinkedIn.

In announcing that it now has more than 300 million members, LinkedIn also said in a blog post: “We know mobile is critical. Later this year, we are going to hit our mobile moment, where mobile accounts for more than 50 percent of all global traffic.”

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